Lake Tana is the largest lake in Ethiopia. It lies at an elevation of 1,788 m (5,866 ft)in the north-western Ethiopian Highlands, and is approximately 84 km (52 miles) long, 66 km (41 miles) wide, with a maximum depth of 15 m (49 ft).
A shallow ephemeral lake in the Gawler Ranges, South Australia, is at the centre of what - now largely eroded - estimated 90 km (56 mi) diameter impact crater?
The Lufra River and then the Lualaba River into which it flows are major headwaters (by volume) of the Congo River. Where do the rivers arise?